The four beakers above each contain 100.-mL of different solutions of similar concentrations. (a) The Kb for ammonia is 1.8 x 10^-5

(i) Which beaker is most likely to contain NH3(aq)? Provide a chemical equation to explain your answer.

(ii) Calculate the molarity of the solution in the beaker that you chose for (i).

(b) If the contents of beakers 3 and 4 are poured together and mixed thoroughly, what will be the resulting pH?

(c) Explain how it is possible that beakers 1 and 4 are acids with equal molarities.

answer: the value of enthalpy change will be -152.80 kj.

solution:

pressure = 1atm , temperature = = 298 k

given that pressure and temperature are same in both gases , the number of moles of both gases can be determined by the ideal gas equation.

according to reaction 3 moles no are reacting with 1 mol of ,then 0.49 mol of no will react with moles of ozone that is 0.16 moles of ozone. since, no is limiting reagent and is an excessive reagent.

enthalpy change for the reaction between the given volumes of the gases is :

your answer is c) plasma

~*"auba14"*~

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.